Enhancing Photostability of Sn‐Pb Perovskite Solar Cells by an Alkylammonium Pseudo‐Halogen Additive

Abstract

crystallization caused low-quality films and Sn 2+ oxidation induced p-doping. [4,5] These are accompanied by defects generated in perovskites, which always leads to quick reduction of the PCE and durability of tin-lead PSCs. [6] Tremendous efforts have been made to reduce the intrinsic defects in Sn-Pb PSCs by developing perovskite processing methods and customizing additives. [7][8][9][10] With advances in past years, the PCE of Sn-Pb PSCs has been elevated to more than 23%, which is still smaller but close to the Pb-based counterparts. [11,12] However, much larger challenges remain in the long-term stability of Sn-Pb PSCs.One concerning observation is that Sn-Pb perovskite photovoltaic devices still degrade much faster under light than Pb perovskites even when they are stored in inert condition or fully encapsulated to separate moisture and oxygen. [13] Recent studies show that they are not only caused

Perovskite single crystals: physical properties and optoelectronic applications

“…It is widely used in optical communication, light-lidar, thermal imaging and other fields. The development of component engineering of perovskites, especially that of narrow-bandgap perovskite materials, is particularly rapid and promotes the application of perovskite materials in IR detection [165,166]. MAPbI 3 single crystals exhibit a much stronger near-IR (NIR) photoresponse than polycrystalline film, well below the optical gap (shown in figure 15(a)).…”

Component Distribution Regulation in Sn‐Pb Perovskite Solar Cells through Selective Molecular Interaction

“…[11,[21][22][23][24][25][26][27][28] The fluoride ion (F − ), chloride ion (Cl − ), thiocyanate ion (SCN − ), tetrafluoroborate (BF 4 − ) could coordinate with Sn 2+ and suppress the formation of tin vacancy. [21,[29][30][31][32] Methylammonium thiocyanate (MASCN) and octylammonium tetrafluoroborate (OABF 4 ) have been used to form strong bonding with metal ions (Sn 2+ /Pb 2+ ) thereby suppressing Sn 2+ oxidation and tin/iodine vacancy formation. [31,32] These previous studies confirm the pivotal role of adjusting the bonding environment of Sn 2+ on suppressing defect formation in Sn-containing perovskite film.…”

Reduced electron relaxation time of perovskite films via g-C3N4 quantum dot doping for high-performance perovskite solar cells

“…29 In addition, less grain boundaries and thickness of perovskite layer are all also key elements contribute to high-efficiency PSCs. 30–34 Large grains can improve the perovskite film morphology and coverage effectively to reach an enhanced light-harvesting under unified light intensity. 35–39…”

“…29 In addition, less grain boundaries and thickness of perovskite layer are all also key elements contribute to high-efficiency PSCs. [30][31][32][33][34] Large grains can improve the perovskite lm morphology and coverage effectively to reach an enhanced light-harvesting under unied light intensity. [35][36][37][38][39] The studies of quantum dots modied PSCs mainly focused on the application of carbon quantum dots (CQDs) in devices, and the application of g-C 3 N 4 QDs in PSCs is rarely reported.…”